SmartExecBridge: a drop-in for PromotionBridge.try_promote that rests entries as PostOnly GTX
makers (via exec_unified.router policy) instead of always paying the taker cross. DORMANT —
selected only by UV_SMART_EXEC=1 (default off); nothing imports it yet, so the running flight
is untouched. T1 = smallest bug surface (spec §15):
- ENTER -> maker (ACQUIRE): PostOnly LIMIT @ touch; unfilled by next scan tick -> CANCEL/abandon
('a missed entry is free' §4-1). No chase, no cross, no requote race.
- EXIT -> MARKET unchanged (never strand; zero new exit risk in v1).
- the 6s scan tick IS the drive clock: sweep-stale-then-place each promote.
Reuses router.decide + friction side-lane (never blocks a promote); fail-soft (never raises
into the scan loop). 11 tests, 2 mutation litmus RED (entry-maker policy; stale-sweep).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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